11.1, test for cations

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13 Terms

1
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Al react with NaOH

  1. White ppt

  2. In excess: white ppt dissolves→ colour less solution

2
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Al react with NH3

  1. White ppt

  2. In excess: white ppt insoluble

3
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Zn react with NaOH

  1. White ppt

  2. In excess: white ppt dissolve→ colour less solution

4
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Zn react with NH3

  1. White ppt

  2. In excess: white ppt dissolves→ colour less solution

5
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Ca react with NaOH

  1. White ppt

  2. In excess: white ppt insoluble

6
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Ca react with NH3

  1. No ppt

  2. In excess: no change

7
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Cu react with NaOH

  1. Light blue ppt

  2. In excess: light blue ppt insoluble

8
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Cu react with NH3

  1. Light blue ppt

  2. In excess: light blue ppt dissolves→ dark blue sol

9
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Fe2 react with NaOH

  1. Green ppt

  2. In excess: green ppt insoluble→ slowly turn reddish brown in air

10
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Fe2 react with NH3

  1. Green ppt

  2. In excess: green ppt insoluble→ slowly turn reddish-brown in air

11
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Fe3 react with NaOH

  1. Reddish brown ppt

  2. In excess: reddish brown ppt insoluble

12
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Fe3 react with NH3

  1. Reddish brown ppt

  2. In excess: reddish brown ppt insoluble

13
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NH4 react with NaOH

  1. No ppt

  2. Warming: colourless & pungent gas which turn moist red litmus blue